* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.container {
    width: 870px;
    margin: auto;
}

.container::after {
    content: "";
    display: table;
    clear: both;
}

header {
    background-color: #54afdb;
    color: #ffffff;
    margin-bottom: 60px;
}

header a {
    color: #ffffff;
}

/*导航部分*/
nav {
    padding-top: 12px;
    padding-bottom: 12px;
    margin-bottom: 60px;
}

nav .col {
    width: 33.333333%;
    float: left;
}

nav::after {
    content: "";
    display: table;
    clear: both;
}

nav a img {
    display: none;
}

.col-left {
    height: 10px;
}

.col-center {
    text-align: center;
}

.col-right {
    text-align: right;
    font-size: 12px;
    font-weight: bold;
}

.col-right a {
    text-decoration: none;
    position: relative;
    top: 5px;
}

/*banner部分*/
.banner {

}

.banner .col {
    width: 50%;
    float: left;
}

.banner::after {
    content: "";
    display: table;
    clear: both;
}

.banner p {
    font-weight: bold;
}

.banner h1 {
    font-weight: 300;
    font-size: 36px;
    margin-bottom: 24px;
}

.banner a {
    background-color: #2996cc;
    padding: 15px 50px;
    display: inline-block;
    font-size: 12px;
    font-weight: bold;
    text-decoration: none;
    transition: .5s;
}

.banner a:hover {
    background-color: #1790cc;
}

.banner img {
    display: block;
    width: 100%;
}

/*主体内容*/
.list {
    margin-bottom: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid #e0e0e0;
}

.list .col {
    width: 25%;
    float: left;
    text-align: center;
    padding-left: 10px;
    padding-right: 10px;
}

.list img {
    margin-bottom: 10px;
}

.list h3 {
    font-size: 14px;
    margin-bottom: 10px;
}

.list p {
    font-size: 14px;
    color: #778191;
}

/*首页下载部分的样式*/

.download {
    text-align: center;
    margin-bottom: 60px;
}

.download h2 {
    font-size: 28px;
    font-weight: 300;
    color: #2e3b4e;
    margin-bottom: 20px;
}

.download p {
    color: #667083;
    margin-bottom: 30px;
}

/*底部的样式*/
footer {
    background-color: #1b2126;
    color: #67737a;
    padding-top: 60px;
    padding-bottom: 60px;
}

/*响应式代码*/
@media (max-width: 600px) {
    .container {
        width: 80%;
    }

    .banner .col {
        width: 100%;
        text-align: center;
    }

    .banner a {
        margin-bottom: 20px;
    }

    nav a span {
        display: none;
    }

    nav a img {
        display: inline-block;
    }

    .list .col {
        width: 100%;
    }
    .download a{
        margin:0 10px;
        display: inline-block;
        width: 40%;
    }
    .download img{
        width: 100%;
    }
}
